Solar System objects

Following is a list of the largest known objects in our Solar System. OOSS exhibits include or mention each of these bodies, with the exception of some trans-Neptunian objects. As the name implies, TNOs have orbits beyond Neptune, and are shown on this list in italics.

If this list were extended in order to include the largest 100 objects in the solar system, the remainder of the list would be comprised almost entirely of TNOs. However, a handful of these largest additional objects are found inside the orbit of Neptune:

Vesta, a main belt asteroid, 525 km in diameter.

Pallas, a main belt asteroid, 512 km in diameter.

Enceladus, a moon of Saturn, 504 km in diameter.

Miranda, a moon of Uranus, 472 km in diameter.

Hygiea, a main belt asteroid, 430 km in diameter.

Proteus, a moon of Neptune, 420 km in diameter.

Mimas, a moon of Saturn, 396 km in diameter.

These objects are roughly half the size of Ceres, so even at the scale of this solar system diagram, they are practically microscopic. However, their orbits are shown in OOSS exhibits because Mimas is the smallest known planetary-mass object, meaning it has enough gravity to pull itself into a rounded (or ellipsoidal) shape.​More info: List of solar system objects by size (Wikipedia)